L68A1 Mast Section Introduction to Foot Screw
A ground foot screw is a screw used to tighten the machine to the ground. It is also called a ground foot bolt. There are many applications in towers, electric power, mines, etc., and they have strong stability.
The foot screws are generally Q235 and Q345, which are round. The screw steel(Q345) is strong, and the screw buckle for making a nut is not easy to round. For a round foot bolt, the buried depth is generally 25 times its diameter, and then a 90-degree hook of about 120mm long is made. If the bolt is large in diameter(such as 45mm) and deep in depth, you can weld the square plate at the top of the bolt, that is, make a large head(but there are certain requirements). Both the buried depth and the bending hook are designed to ensure the friction between the bolt and the foundation, so that the bolt does not break out.
Therefore, the tensile ability of the foot bolt is the tensile ability of the round steel itself. The size is equal to the cross-sectional area multiplied by the tensile strength design value(140MPa) is the allowable tensile capacity at the time of design.
The limit tensile capacity is to multiply its cross-sectional area(at this time it should be the effective area at the thread) by the tensile strength of the steel(Q235 tensile strength is 235 MPa). Because the design value is biased towards safety, the tensile force at the time of design is less than the ultimate tensile force.
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